bootinfo.c revision 223695 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/userboot/userboot/bootinfo.c 223695 2011-06-30 16:08:56Z dfr $");
29
30#include <stand.h>
31#include <sys/param.h>
32#include <sys/reboot.h>
33#include <sys/linker.h>
34
35#include "bootstrap.h"
36#include "libuserboot.h"
37
38/*
39 * Return a 'boothowto' value corresponding to the kernel arguments in
40 * (kargs) and any relevant environment variables.
41 */
42static struct
43{
44    const char	*ev;
45    int		mask;
46} howto_names[] = {
47    {"boot_askname",	RB_ASKNAME},
48    {"boot_cdrom",	RB_CDROM},
49    {"boot_ddb",	RB_KDB},
50    {"boot_dfltroot",	RB_DFLTROOT},
51    {"boot_gdb",	RB_GDB},
52    {"boot_multicons",	RB_MULTIPLE},
53    {"boot_mute",	RB_MUTE},
54    {"boot_pause",	RB_PAUSE},
55    {"boot_serial",	RB_SERIAL},
56    {"boot_single",	RB_SINGLE},
57    {"boot_verbose",	RB_VERBOSE},
58    {NULL,	0}
59};
60
61int
62bi_getboothowto(char *kargs)
63{
64    char	*cp;
65    char	*curpos, *next, *string;
66    int		howto;
67    int		active;
68    int		i;
69    int		vidconsole;
70
71    /* Parse kargs */
72    howto = 0;
73    if (kargs  != NULL) {
74	cp = kargs;
75	active = 0;
76	while (*cp != 0) {
77	    if (!active && (*cp == '-')) {
78		active = 1;
79	    } else if (active)
80		switch (*cp) {
81		case 'a':
82		    howto |= RB_ASKNAME;
83		    break;
84		case 'C':
85		    howto |= RB_CDROM;
86		    break;
87		case 'd':
88		    howto |= RB_KDB;
89		    break;
90		case 'D':
91		    howto |= RB_MULTIPLE;
92		    break;
93		case 'm':
94		    howto |= RB_MUTE;
95		    break;
96		case 'g':
97		    howto |= RB_GDB;
98		    break;
99		case 'h':
100		    howto |= RB_SERIAL;
101		    break;
102		case 'p':
103		    howto |= RB_PAUSE;
104		    break;
105		case 'r':
106		    howto |= RB_DFLTROOT;
107		    break;
108		case 's':
109		    howto |= RB_SINGLE;
110		    break;
111		case 'v':
112		    howto |= RB_VERBOSE;
113		    break;
114		default:
115		    active = 0;
116		    break;
117		}
118	    cp++;
119	}
120    }
121    /* get equivalents from the environment */
122    for (i = 0; howto_names[i].ev != NULL; i++)
123	if (getenv(howto_names[i].ev) != NULL)
124	    howto |= howto_names[i].mask;
125
126    /* Enable selected consoles */
127    string = next = strdup(getenv("console"));
128    vidconsole = 0;
129    while (next != NULL) {
130	curpos = strsep(&next, " ,");
131	if (*curpos == '\0')
132		continue;
133	if (!strcmp(curpos, "vidconsole"))
134	    vidconsole = 1;
135	else if (!strcmp(curpos, "comconsole"))
136	    howto |= RB_SERIAL;
137	else if (!strcmp(curpos, "nullconsole"))
138	    howto |= RB_MUTE;
139    }
140
141    if (vidconsole && (howto & RB_SERIAL))
142	howto |= RB_MULTIPLE;
143
144    /*
145     * XXX: Note that until the kernel is ready to respect multiple consoles
146     * for the boot messages, the first named console is the primary console
147     */
148    if (!strcmp(string, "vidconsole"))
149	howto &= ~RB_SERIAL;
150
151    free(string);
152
153    return(howto);
154}
155
156void
157bi_setboothowto(int howto)
158{
159    int		i;
160
161    for (i = 0; howto_names[i].ev != NULL; i++)
162	if (howto & howto_names[i].mask)
163	    setenv(howto_names[i].ev, "YES", 1);
164}
165
166/*
167 * Copy the environment into the load area starting at (addr).
168 * Each variable is formatted as <name>=<value>, with a single nul
169 * separating each variable, and a double nul terminating the environment.
170 */
171vm_offset_t
172bi_copyenv(vm_offset_t addr)
173{
174    struct env_var	*ep;
175
176    /* traverse the environment */
177    for (ep = environ; ep != NULL; ep = ep->ev_next) {
178        CALLBACK(copyin, ep->ev_name, addr, strlen(ep->ev_name));
179	addr += strlen(ep->ev_name);
180	CALLBACK(copyin, "=", addr, 1);
181	addr++;
182	if (ep->ev_value != NULL) {
183            CALLBACK(copyin, ep->ev_value, addr, strlen(ep->ev_value));
184	    addr += strlen(ep->ev_value);
185	}
186	CALLBACK(copyin, "", addr, 1);
187	addr++;
188    }
189    CALLBACK(copyin, "", addr, 1);
190    addr++;
191    return(addr);
192}
193